By requesting this method, the department list data can be obtained. Based on the department list data, it can be used to add child departments.

public function getDeptList() 
{
    include_once('../vendor/zentao/zentao.php');
    $zentao      = new \zentao();
    $params      = array('deptID' => 1);    // parameters of the method
    $extraFields = array('title', 'deptID', 'parentDepts', 'sons', 'tree');    // customize fields returned
    $result      = $zentao->getDeptList($params, $extraFields);
    return $result;
}

getDeptList

{
    "status": 1,
    "msg": "success",
    "result": {
        //the navbar of ZenTao
        "title": "Manage Department-ZenTao",
        //Department ID
        "deptID": "1",
        //Department information
        "parentDepts": [
            {
                "id": "1",
                "name": "Manager",
                "parent": "0",
                "path": ",1,",
                "grade": "1",
                "order": "0",
                "position": "",
                "function": "",
                "manager": ""
            }
        ],
        //child department list of the current department
        "sons": [
            {
                "id": "11",
                "name": "PO",
                "parent": "1",
                "path": ",1,11,",
                "grade": "2",
                "order": "10",
                "position": "",
                "function": "",
                "manager": ""
            },
            {
                "id": "12",
                "name": "PM",
                "parent": "1",
                "path": ",1,12,",
                "grade": "2",
                "order": "20",
                "position": "",
                "function": "",
                "manager": ""
            }
        ],
        //department tree
        "tree": [
            {
                "id": "1",
                "name": "Manager",
                "parent": "0",
                "path": ",1,",
                "grade": "1",
                "order": "0",
                "position": "",
                "function": "",
                "manager": "",
                "managerName": "",
                "children": [
                    {
                        "id": "11",
                        "name": "PO",
                        "parent": "1",
                        "path": ",1,11,",
                        "grade": "2",
                        "order": "10",
                        "position": "",
                        "function": "",
                        "manager": "",
                        "managerName": ""
                    },
                    {
                        "id": "12",
                        "name": "PM",
                        "parent": "1",
                        "path": ",1,12,",
                        "grade": "2",
                        "order": "20",
                        "position": "",
                        "function": "",
                        "manager": "",
                        "managerName": ""
                    }
                ],
                "actions": {
                    "delete": false
                }
            },
            {
                "id": "2",
                "name": "Dev",
                "parent": "0",
                "path": ",2,",
                "grade": "1",
                "order": "1",
                "position": "",
                "function": "",
                "manager": "",
                "managerName": ""
            },
            {
                "id": "3",
                "name": "QA",
                "parent": "0",
                "path": ",3,",
                "grade": "1",
                "order": "2",
                "position": "",
                "function": "",
                "manager": "",
                "managerName": ""
            },
            {
                "id": "4",
                "name": "Sales",
                "parent": "0",
                "path": ",4,",
                "grade": "1",
                "order": "3",
                "position": "",
                "function": "",
                "manager": "",
                "managerName": ""
            },
            {
                "id": "8",
                "name": "Customer",
                "parent": "0",
                "path": ",8,",
                "grade": "1",
                "order": "13",
                "position": "",
                "function": "",
                "manager": "",
                "managerName": ""
            }
        ]
    }
}

{
    "status": 0,
    "msg": "error",
    "result": []
}